How long does Yeast last in the fridge once opened?
Turning the range into a date
Yeast keeps 4 months in the fridge once opened. Two clocks run on this item: one from the day it went into storage and one from the day the seal broke. Both are listed below, 3 rows in all.
- In the freezerUse by6 months after the day you stored it
- Unopened · in the pantryUse by2 years after the day you bought it
- Once opened · in the fridgeUse by4 months after the day you opened it
What opening the package actually costs
Opening the package is the decision that settles this page. Sealed, the item holds 2 years sealed in the pantry; once open it holds 4 months open in the fridge, the same food measured in months instead of years, a drop of 6.1 times. On the same shelf it sits 3 of 52, between Coconut flavor at 2 years and Cornstarch at 24 months. Packaged in the source list is this same food.
Every storage figure the USDA publishes for this item
All three places the USDA recognizes are rated here — pantry, refrigerator and freezer — which only 65 of the 466 foods in the data manage. Within Baked Goods it is filed under Baking and Cooking.
- In the freezer6 months
- Unopened · in the pantry2 years
- Once opened · in the fridge4 months
What the USDA adds in words
The USDA attaches 1 handling note to this item, reproduced below word for word. It is not a storage time: it qualifies the figure above rather than replacing it. These are the source's own sentences, not ours, and they are the part of the FoodKeeper record that a table of durations cannot carry.
In the pantry, from the day you bought it. Store in cool, dry place. Must be refrigerated or frozen once opened.
Can you freeze yeast?
Yes. The USDA gives yeast 6 months in the freezer, and held at 0 °F food stays safe beyond that: the figure is about quality. Freeze it well wrapped while it is still well inside its fridge window: the freezer keeps quality, it does not restore it.
How to tell if yeast has gone bad
Go by the date first: yeast keeps 4 months in the fridge once opened. A sour or off smell, mold, slime or an odd color mean it goes out. The bacteria that make people sick change none of these, so past its window it goes out even if it seems fine. Never taste to test.
Sources: USDA FSIS: the danger zone USDA FSIS: freezing and food safety USDA FSIS: molds on food FDA: are you storing food safely FoodSafety.gov: the FoodKeeper app.
Is it still safe to eat, or just past its best?
The answer at the top of this page reads 4 months in the fridge once opened. What decides that is the food and not the shelf the source files it on: Yeast, packaged is acid, dry, sweet, alcoholic or pure fat. Past it, whether it has gone bad is yours to judge by look and smell: this window rates quality, not the day it turns hazardous.
It is past the date. Now what?
Say the calculator above puts Yeast, packaged past its 4 months in the fridge once opened window. Past that the calendar stops deciding and the food itself does. Mold takes the whole package out rather than the slice it grew on, and so does a musty or old-oil smell in a flour or a mix.
The whole rule, including the cases the source does not cover, is set out under what to do when the date has passed.
Items that behave the same way
All 6 of the 6 items nearest this item keep exactly as long as it does, 2 years, so the ranking around it is a tie rather than an order.
Where these numbers come from
Every storage time on this page is the USDA’s own published figure from the FoodKeeper data, one of the 9 it keeps per food, reproduced unchanged and never an estimate of ours. Where the USDA lists several kinds under one name, each kind keeps its own windows, and the page names the kind its answer is for. The dates and multipliers are ours, computed from those ranges.
Source: USDA FoodKeeper, retrieved 1 September 2026. Found a figure that does not match the source? Tell us on the contact page. How the site is built is on the method page.
USDA index terms: packaged, Yeast
KeepsUntil is an independent reference built on public USDA data. It is not affiliated with, endorsed by, or connected to the U.S. Department of Agriculture or the Food and Drug Administration. Whether a given window is a safety limit or a quality window is stated on the page that prints it.